Commutator



l. W. PEARSON.

COMMUTATOR.

APPLICATION FILED SEPT-6, 1518- 1,338,092, Patented Apr. 27, 1920.

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JOHN W. PEARSON, OF CHICAGO, ILLINOIS.

COMMUTA'IOR.

Application filed September 6, 1918.

To all whom it may concern Be it known that l, JorrN V. PnAnsoN, a citizen of the United States of America, and a resident of Chicago, county of Cook, and State of Illinois, have invented certain new and useful Improvements in Commutators, of which the following is specification.

This invention relates to commutators for dyanmo-electric machines, and more particularly to means for securing the segmen holding members in due clamping relation. This application is based mainly on matter divided from my prior application Serial No. 99,980 filed May 26, 1916, Patent No. 1,278,201.

l-leretofore one of the more prevalent means for securing the bar clamping members in place has been a nut and screw con struction whereby upon tightly setting the nut the clamp was drawn tightly upon the insulated commutator bars or segments and the latter held in a rigid unitary manner. Subsequently, in order to simplify and cheapen the construction and to eliminate the threaded feature, the edge of one of the clamping members, namely, the commutator center, was expanded and thereby engaged with the inner edge of the outer member or cap ring, either by spinning or swaging against the main body thereof, whereby the parts were permanently locked in clamping relation on the insulated commutator segments. It has been found in many cases that the expanding process as applied to the commutator center has resulted in also permanently expanding the entire cap ring, thereby loosening the commutator bars and rendering the commutator defective.

The main objects of this invention are to provide an improved means or form of fastening for the clamping members, adapted for locking the constituent parts rigidly. to gether, mechanically without any danger of expanding the bar engaging parts of either of the complementary gripping members, or in any degree loosening the commutator ments; to provide cheap and ready neans for securing the clamping members together adapted for subsequent disengagement without destruction of or injury to any of the parts in case it is desired to take the commutator apart; to provide accessible projecting or outstanding parts of relatively yielding character in registry on the clamping members which may be interlocked by Specification of Letters Patent.

Patented Apr. 27, 1920.

Serial No. 252,921.

suitable deformation or bending and so fastened together, and which may be subsequently cut away or otherwise released if desired; and to provide an outstanding peripheral flange or seriesof projections on one of the segment-holding members adapted for engagement with he complementary member.

An illustrative embodiment of the invention is shown in the accompanying drawings, in which- Figure 1 is a side view of one end of an unfinished armature equipped with the improved commutator, part of the commuta or connecting leads being removed to sh w co:- tain interior details and the lock ng means on the commutator being ready for expansion.

Fig. 2 is a section at 2-2 on Fig. 1 prior to expanding the locking flanges or lips and includes a side view of the commutator showing said flanges ready for expansion.

Fig. 3 is a longitudinal axial section through the commutator on the line of Fig. 2. I

Fig. 1 is an enlarged fragmentary view looking outward, and shows a modification consisting of a malleable lug or projecting tip which may be substituted for or formed on the peripheral flange or lipshown in Figs. 1 to 3.

Fig. 5 is a fragmentary cross section at 5-5 of Fig. 2, the locking flanges being expanded and the parts locked together. 7

In the embodiment shown in Figs. 1, 2 and 3, the commutator as a whole comprises a pair of complementary annular clamping members or rings 2 and 3, known as center and cap ring, formed to wedgingly engage the commutator bars or segments t which are insulated from each other and from said clamping means.

The clamping rings 2 and 3 are adapted for assembling by relative movement lengthwise of the commutator axis. T hey are formed to fit together telescopically and a re provided with inwardly disposed flanges (3 and 7 respectively adapted to wedgmgly embrace and clamp the correspomlingiv formed commutator segments. said ll: having inclined or frusto-conical inwardly facing surfaces, so that when the c aliipiliyj rings are forced convergently upon said sr ments and suitably fastened, the commutator parts are held rigidly in a unitary man- Said clamping rings 2 and 3 are provided with laterally projecting peripheral flangelike shoulders or lips 8 and 9 respectively disposed concentrically, one overlying the other with their outer edges substantially flush with each other when the parts are assembled. Said clamping rings or parts thereof are malleable in character, and may be locked in clamping position by securing said shoulders or lips together by expanding, as by swaging or spinning, while the clamp is held stationary under pressure, as in an arbor press.

In order that the commutator may be taken apart the more readily if desired, the expanding may be limited to a series of points or segments spaced apart, where the lips may be overturned or swaged locally as indicated at 12. Such local swaging may be facilitated by cutting or notching the flanges on each side of the part 12, as indicated at 12..

In order to disengage the clamping rings it is only necessary to turn back or raise the flanges, or to straighten out or remove the swaged parts 12. Said parts may be re moved if desired either by filing or cutting away with a cold chisel or any other means that may be found practicable.

The release or removal of the fastenings is most facilitated where the fz'istening means is in the form of registered outstandinglips or lugs 15 which may be very eas ily removed (see Fig. 4). Such lugs may be formed substantially as lip segments directly on the body of the ring or on the ed e of a flange such as above described.

Insulation is indicated by numeral '18. In Fig. 1 the commutator is shown mounted on the shaft 20 together with the armature proper 21, which is connected to the commutator bars by means such as represented at 24:.

As shown in Fig. 5 the center ring 2 has its flange 8 swaged outward uniformly over the adjacent part 01' flange 9 of the complementary member or cap ring 3. The form of fastening herein described, it will be noted, permits of locking by simple deformation or swaging, all danger of expanding the body of the cap ring being avoided by virtue of the outstanding malleable flange 9 against which the center flange is swaged, and which protects the body of the cap ring from direct expanding force.

Although but one embodiment of this invention is herein shown and described, it will be understood that some of the details of the construction shown may be altered or omitted without departing from the spirit of the invention as defined by the following claims.

I claim:

1. In a device of the character described, a pair of concentric clamping members adapted to be assembled telescopically, said members having corresponding thin malleable flanges, adapted to be expanded for locking said members together.

2. In a commutator, a pair of clamping rings having outstanding parts arranged in radial registry adapted to be outwardly swaged to secure the commutator parts rigidly together.

3. A commutator comprising a pair of clamping rings having concentric outstanding cylindrical parts of malleable character, said parts being notched in registry and having segments adapted to be swaged back. the inner against the outer for locking said rings together.

1. The process of assembling the parts of a commutator which consists in pressing the cap-ring and center toward each other telescopically in a stationary press to grip the segments, and then expanding a pair of thin concentric swaging fasteners formed on the main body of the cap-ring and center respectiy'ely and adapted to lock said members together when under pressure in the press.

The method of constructing and repairing a commutator which consists in pro viding malleable outside contiguous parts on the clamping rings which hold the segments in place, swaging said parts together when the commutator is assembled, subsequently disconnecting the attachment for repair purposes by removing or bending back the engaging parts for releasing said rings, and then when the device is again assembled, reswaging said parts for secur ing said rings together.

Signed at Chicago this 9th day of August, 1918. 1

JOHN IV. PEARSON. 

